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23 Cards in this Set
- Front
- Back
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Scientific Method
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Based fundamentally on observation, logic, and skepticism.
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Models
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hypotheses that have withstood observational or experimental tests.
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Theory
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A body of related gypotheses can be pieced together into a self-consistent description of nature called a...
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Laws of Physics
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Proven theories of this kind are collectively referred to as laws ......
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Nebulae
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Huge clouds of interstellar gas
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Spernova
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Some stars that are far more massive than our sun die and the star blows apart this is considered?
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Galaxies
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Stars are not spred uniformly across the universe but are grouped together in huge assemblages called..
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Quasars
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Light takes billions of years to reach the earth, these are distant and luminous objects in our sky
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Big Bang
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13.7 bukkuib tears ago, a moment at the begining of time, the universe began with a cosmic explosion
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Angle
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Opening between two lines that meet a point.
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Angular measure
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Decribes the size of an angle exactly
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Degree
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Is the basic unit of angular measure, also has a designated symbol
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Angular distance
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The distance between two stars is about 5 degrees
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Angular diameter
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Of the moon is 1/2 a degree
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Arcminutes
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Also called minutes of arc, abreviated 60 arcmin or 60'.
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Arcseconds
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Arcminute is futher subdivided into 60 arcseconds, usually written as 60 arcsec or 60''.
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Powers of Ten notation
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All the cumbersome zeros that accompany a large number are consolidated into one term consisting of 10
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10 to 0 power =
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1 (one)
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10 to 1 power =
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10 (ten)
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Astronomical Unit (AU)
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When discussing distances across the solar system, astronomers use a unit of length called ....
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Light-Year (ly)
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Is the distance that light travels in one year.
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Parsec (pc)
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The distance at which 1 AU subtends an angle of 1 arcsec is defined as 1 .......
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Kiloparsecs and mega parsecs
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Kilo x10 pc, Mego x10pc
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